Value of a 1963A $10 bill, and 1974 $20 bill?

Hey,

I've been holding onto an old 1963A $10 bill that I got from my friend
at my local 7 Eleven, and was wondering if it was worth anything. The
$10 bill is a star note serial number G08206908* The bill is in fairly
good condidion, and its still a bit crisp.

The $20 bill is not a star, but it is from 1974, that I got from a
party store, when I cashed a check. Serial number G57638369E. This $20
is in very good condition, almost like new.

So, could these bills command a small premium at all, or are they just
worth their face value?

(Even though this is a paper money topic, I'm also posting it here on
the coin group, since more people come here than to r.c.p-m.)

Tom